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Joint Channel Estimation and Equalization Using New AFB Output Signal Models for FBMC/OQAM Systems.

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Title: Joint Channel Estimation and Equalization Using New AFB Output Signal Models for FBMC/OQAM Systems.
Authors: Ren, Defeng1 (AUTHOR) rdf_xidian@126.com, Li, Jing2 (AUTHOR) jli@xidian.edu.cn, Lu, Guangyue1 (AUTHOR) tonylugy@163.com, Ge, Jianhua2 (AUTHOR) jhge@xidian.edu.cn
Source: IEEE Transactions on Communications. Jun2021, Vol. 69 Issue 6, p4186-4201. 16p.
Subjects: Channel estimation, Frequency division multiple access, Quadrature amplitude modulation, Filter banks, Least squares, Wireless communications
Abstract: Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) has been studied as an alternative waveform for post-orthogonal frequency division multiplexing (OFDM) wireless communications. However, due to the intrinsic imaginary inter-carrier/inter-symbol interference of FBMC/OQAM signals, accurate channel estimation and equalization remain open issues for FBMC/OQAM systems in dispersive channels. In this article, two new signal models of the analysis filter bank (AFB) output are first derived in the absence of any channel assumption and in the presence of a relaxed channel assumption, respectively. Based on the new-built models, initial channel estimation with least squares (LS) (IniCE-LS) is presented and its output is used as the initial condition of recursive weighted LS (RWLS) estimation; moreover, non-iterative and iterative channel equalization combined with RWLS channel estimation (i.e., N-ICE-RWLS and ICE-RWLS) are proposed by using the real-time reconstructed FBMC/OQAM data symbols as pilots. The proposed N-ICE-RWLS and ICE-RWLS schemes not only allow to improve channel estimation and equalization performance, but also achieve high transmission efficiency. Considering the requirements of practical application, we further develop the low-complexity implementation methods of N-ICE-RWLS and ICE-RWLS. All these schemes are validated by analyzing the channel estimation accuracy and bit error rate (BER) over various frequency selective channels. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Communications is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 151250204
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PubTypeId: academicJournal
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  Label: Title
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  Data: Joint Channel Estimation and Equalization Using New AFB Output Signal Models for FBMC/OQAM Systems.
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  Data: <searchLink fieldCode="AR" term="%22Ren%2C+Defeng%22">Ren, Defeng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rdf_xidian@126.com</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Jing%22">Li, Jing</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> jli@xidian.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Lu%2C+Guangyue%22">Lu, Guangyue</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tonylugy@163.com</i><br /><searchLink fieldCode="AR" term="%22Ge%2C+Jianhua%22">Ge, Jianhua</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> jhge@xidian.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Communications%22">IEEE Transactions on Communications</searchLink>. Jun2021, Vol. 69 Issue 6, p4186-4201. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Channel+estimation%22">Channel estimation</searchLink><br /><searchLink fieldCode="DE" term="%22Frequency+division+multiple+access%22">Frequency division multiple access</searchLink><br /><searchLink fieldCode="DE" term="%22Quadrature+amplitude+modulation%22">Quadrature amplitude modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Filter+banks%22">Filter banks</searchLink><br /><searchLink fieldCode="DE" term="%22Least+squares%22">Least squares</searchLink><br /><searchLink fieldCode="DE" term="%22Wireless+communications%22">Wireless communications</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) has been studied as an alternative waveform for post-orthogonal frequency division multiplexing (OFDM) wireless communications. However, due to the intrinsic imaginary inter-carrier/inter-symbol interference of FBMC/OQAM signals, accurate channel estimation and equalization remain open issues for FBMC/OQAM systems in dispersive channels. In this article, two new signal models of the analysis filter bank (AFB) output are first derived in the absence of any channel assumption and in the presence of a relaxed channel assumption, respectively. Based on the new-built models, initial channel estimation with least squares (LS) (IniCE-LS) is presented and its output is used as the initial condition of recursive weighted LS (RWLS) estimation; moreover, non-iterative and iterative channel equalization combined with RWLS channel estimation (i.e., N-ICE-RWLS and ICE-RWLS) are proposed by using the real-time reconstructed FBMC/OQAM data symbols as pilots. The proposed N-ICE-RWLS and ICE-RWLS schemes not only allow to improve channel estimation and equalization performance, but also achieve high transmission efficiency. Considering the requirements of practical application, we further develop the low-complexity implementation methods of N-ICE-RWLS and ICE-RWLS. All these schemes are validated by analyzing the channel estimation accuracy and bit error rate (BER) over various frequency selective channels. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Communications is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1109/TCOMM.2021.3064059
    Languages:
      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 4186
    Subjects:
      – SubjectFull: Channel estimation
        Type: general
      – SubjectFull: Frequency division multiple access
        Type: general
      – SubjectFull: Quadrature amplitude modulation
        Type: general
      – SubjectFull: Filter banks
        Type: general
      – SubjectFull: Least squares
        Type: general
      – SubjectFull: Wireless communications
        Type: general
    Titles:
      – TitleFull: Joint Channel Estimation and Equalization Using New AFB Output Signal Models for FBMC/OQAM Systems.
        Type: main
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          Name:
            NameFull: Ren, Defeng
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            NameFull: Li, Jing
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            NameFull: Lu, Guangyue
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            NameFull: Ge, Jianhua
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            – D: 01
              M: 06
              Text: Jun2021
              Type: published
              Y: 2021
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              Value: 69
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            – TitleFull: IEEE Transactions on Communications
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